Javascript function to group repeated values of an array with totals

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Something that took a little while to pull of well while working on the JS
challenge this week (https://blog.omgmog.net/post/js-challenge-070311/), thought
I’d throw it up here as it has its uses practically for grouping like array
values with totals:

var testdata = ['a','a','a','b','b','c','c','c','c','d','d','d','e'];
var i=0, x, count, item;
while(i < testdata.length){
    count = 1;
    item = testdata[i];
    x = i+1;

    while(x < testdata.length && (x=testdata.indexOf(item,x))!=-1){
        count+=1;
        testdata.splice(x,1);
    }
    testdata[i] = new Array(testdata[i],count);
    ++i;
}
console.log(testdata);

This is outputting to the console log for the sake of testing it, but the kind
of output you’d expect to see is a multidimensional array.

Should have the rest of my solution to the challenge up tomorrow, with a nice
post explaining the tough time Tomas (http://tmayr.com) and I have had fighting
our urge to reveal code/brainstorm together.

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Published March 11, 2011

Generated from the original post:
https://blog.omgmog.net/post/javascript-function-to-group-repeated-values-of-an-array-with-totals/


Max Glenister is an interface designer and senior full-stack developer from
Oxfordshire. He writes mostly about front-end development and technology.

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